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Unusually stable saponite in the system Na2O-MgO-Al2O3-SiO2

Published online by Cambridge University Press:  14 March 2018

J. T. Iiyama  and
R. Roy
J. T. Iiyama
Affiliation:
The Pennsylvania State University, University Park, Pa., U.S.A.
R. Roy
Affiliation:
The Pennsylvania State University, University Park, Pa., U.S.A.
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Abstract

A hydrothermal synthetic study on the relationship between the stability and the composition of sodium saponite solid solutions revealed that a special trioctahedral sodium smectite can persist stably up to temperatures as high as 850°C under a water pressure of 1 kb. This smectite has a composition close to Na0·55(Mg2·70Al0·30) (Si3·15Al0·85)O10(OH)2. nH2O as estimated from the chemical composition of gels that yield this smectite in essentially pure form at the highest temperatures, and from other phase evidence. The composition range of these trioctahedral sodium smectites and phase relationships around the smectite field in the system Na2O-MgO-Al2O3-SiO2-H2O are also briefly described in the temperature range 600–800°C under a pressure of 1 kb.

Type
Research Article
Information
Clay Minerals Bulletin , Volume 5 , Issue 29 , July 1963 , pp. 161 - 171
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1963

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